>Please help<

So I switched my birth control and didn’t take it for one day while my new one was coming in and me and my bf had sex (the app said it was my time of ovulation we did do the pull out method, it’s been about 3 and half 4 weeks ago and I’m noticing some changes in my appetite and boobs, my boobs are more perky I guess and the nipple is poking out constantly, there’s a dark ring around it too, I’ve been having cravings for pickles and ice mainly but I’m eating wayyyyy more then usual like I can’t get full. I’m nauseous through out the day and extremely moody, I took a early response test and it was negative but I still had 7 days till my period (I have 4 days now) could it be the change in my birth control or could I be pregnant??